The line that best describes one effect of the poet's use of simile in this excerpt is: C. It shows the VC's coordination in the face of obstacles to emphasize the challenging nature of the environment.
According to the dictionary, a simile is "a figure of speech involving the comparison of one thing with another thing of a different kind, used to make a description more emphatic or vivid". The poet says "VC struggled with the hillside, <em>like black silk wrestling iron through grass</em>." That image evokes the challenges of nature and of the surroundings of VC, and in turn, highlight his coordination to overcome such obstacles.
I confirmed the answer as C. It shows the VC's coordination in the face of obstacles to emphasize the challenging nature of the environment. Through Apex